package rui import ( "strings" ) const ( // PointerDown is the constant for "pointer-down" property tag. // The "pointer-down" event is fired when a pointer becomes active. For mouse, it is fired when // the device transitions from no buttons depressed to at least one button depressed. // For touch, it is fired when physical contact is made with the digitizer. // For pen, it is fired when the stylus makes physical contact with the digitizer. // The main listener format: func(View, PointerEvent). // The additional listener formats: func(PointerEvent), func(View), and func(). PointerDown = "pointer-down" // PointerUp is the constant for "pointer-up" property tag. // The "pointer-up" event is fired when a pointer is no longer active. // The main listener format: func(View, PointerEvent). // The additional listener formats: func(PointerEvent), func(View), and func(). PointerUp = "pointer-up" // PointerMove is the constant for "pointer-move" property tag. // The "pointer-move" event is fired when a pointer changes coordinates. // The main listener format: func(View, PointerEvent). // The additional listener formats: func(PointerEvent), func(View), and func(). PointerMove = "pointer-move" // PointerCancel is the constant for "pointer-cancel" property tag. // The "pointer-cancel" event is fired if the pointer will no longer be able to generate events // (for example the related device is deactivated). // The main listener format: func(View, PointerEvent). // The additional listener formats: func(PointerEvent), func(View), and func(). PointerCancel = "pointer-cancel" // PointerOut is the constant for "pointer-out" property tag. // The "pointer-out" event is fired for several reasons including: pointing device is moved out // of the hit test boundaries of an element; firing the pointerup event for a device // that does not support hover (see "pointer-up"); after firing the pointercancel event (see "pointer-cancel"); // when a pen stylus leaves the hover range detectable by the digitizer. // The main listener format: func(View, PointerEvent). // The additional listener formats: func(PointerEvent), func(View), and func(). PointerOut = "pointer-out" // PointerOver is the constant for "pointer-over" property tag. // The "pointer-over" event is fired when a pointing device is moved into an view's hit test boundaries. // The main listener format: func(View, PointerEvent). // The additional listener formats: func(PointerEvent), func(View), and func(). PointerOver = "pointer-over" ) type PointerEvent struct { MouseEvent // PointerID is a unique identifier for the pointer causing the event. PointerID int // Width is the width (magnitude on the X axis), in pixels, of the contact geometry of the pointer. Width float64 // Height is the height (magnitude on the Y axis), in pixels, of the contact geometry of the pointer. Height float64 // Pressure is the normalized pressure of the pointer input in the range 0 to 1, where 0 and 1 represent // the minimum and maximum pressure the hardware is capable of detecting, respectively. Pressure float64 // TangentialPressure is the normalized tangential pressure of the pointer input (also known // as barrel pressure or cylinder stress) in the range -1 to 1, where 0 is the neutral position of the control. TangentialPressure float64 // TiltX is the plane angle (in degrees, in the range of -90 to 90) between the Y–Z plane // and the plane containing both the pointer (e.g. pen stylus) axis and the Y axis. TiltX float64 // TiltY is the plane angle (in degrees, in the range of -90 to 90) between the X–Z plane // and the plane containing both the pointer (e.g. pen stylus) axis and the X axis. TiltY float64 // Twist is the clockwise rotation of the pointer (e.g. pen stylus) around its major axis in degrees, // with a value in the range 0 to 359. Twist float64 // PointerType indicates the device type that caused the event ("mouse", "pen", "touch", etc.) PointerType string // IsPrimary indicates if the pointer represents the primary pointer of this pointer type. IsPrimary bool } func valueToPointerListeners(value interface{}) ([]func(View, PointerEvent), bool) { if value == nil { return nil, true } switch value := value.(type) { case func(View, PointerEvent): return []func(View, PointerEvent){value}, true case func(PointerEvent): fn := func(view View, event PointerEvent) { value(event) } return []func(View, PointerEvent){fn}, true case func(View): fn := func(view View, event PointerEvent) { value(view) } return []func(View, PointerEvent){fn}, true case func(): fn := func(view View, event PointerEvent) { value() } return []func(View, PointerEvent){fn}, true case []func(View, PointerEvent): if len(value) == 0 { return nil, true } for _, fn := range value { if fn == nil { return nil, false } } return value, true case []func(PointerEvent): count := len(value) if count == 0 { return nil, true } listeners := make([]func(View, PointerEvent), count) for i, v := range value { if v == nil { return nil, false } listeners[i] = func(view View, event PointerEvent) { v(event) } } return listeners, true case []func(View): count := len(value) if count == 0 { return nil, true } listeners := make([]func(View, PointerEvent), count) for i, v := range value { if v == nil { return nil, false } listeners[i] = func(view View, event PointerEvent) { v(view) } } return listeners, true case []func(): count := len(value) if count == 0 { return nil, true } listeners := make([]func(View, PointerEvent), count) for i, v := range value { if v == nil { return nil, false } listeners[i] = func(view View, event PointerEvent) { v() } } return listeners, true case []interface{}: count := len(value) if count == 0 { return nil, true } listeners := make([]func(View, PointerEvent), count) for i, v := range value { if v == nil { return nil, false } switch v := v.(type) { case func(View, PointerEvent): listeners[i] = v case func(PointerEvent): listeners[i] = func(view View, event PointerEvent) { v(event) } case func(View): listeners[i] = func(view View, event PointerEvent) { v(view) } case func(): listeners[i] = func(view View, event PointerEvent) { v() } default: return nil, false } } return listeners, true } return nil, false } var pointerEvents = map[string]struct{ jsEvent, jsFunc string }{ PointerDown: {jsEvent: "onpointerdown", jsFunc: "pointerDownEvent"}, PointerUp: {jsEvent: "onpointerup", jsFunc: "pointerUpEvent"}, PointerMove: {jsEvent: "onpointermove", jsFunc: "pointerMoveEvent"}, PointerCancel: {jsEvent: "onpointercancel", jsFunc: "pointerCancelEvent"}, PointerOut: {jsEvent: "onpointerout", jsFunc: "pointerOutEvent"}, PointerOver: {jsEvent: "onpointerover", jsFunc: "pointerOverEvent"}, } func (view *viewData) setPointerListener(tag string, value interface{}) bool { listeners, ok := valueToPointerListeners(value) if !ok { notCompatibleType(tag, value) return false } if listeners == nil { view.removePointerListener(tag) } else if js, ok := pointerEvents[tag]; ok { view.properties[tag] = listeners if view.created { updateProperty(view.htmlID(), js.jsEvent, js.jsFunc+"(this, event)", view.Session()) } } else { return false } return true } func (view *viewData) removePointerListener(tag string) { delete(view.properties, tag) if view.created { if js, ok := pointerEvents[tag]; ok { updateProperty(view.htmlID(), js.jsEvent, "", view.Session()) } } } func getPointerListeners(view View, subviewID string, tag string) []func(View, PointerEvent) { if subviewID != "" { view = ViewByID(view, subviewID) } if view != nil { if value := view.Get(tag); value != nil { if result, ok := value.([]func(View, PointerEvent)); ok { return result } } } return []func(View, PointerEvent){} } func pointerEventsHtml(view View, buffer *strings.Builder) { for tag, js := range pointerEvents { if value := view.getRaw(tag); value != nil { if listeners, ok := value.([]func(View, PointerEvent)); ok && len(listeners) > 0 { buffer.WriteString(js.jsEvent + `="` + js.jsFunc + `(this, event)" `) } } } } func (event *PointerEvent) init(data DataObject) { event.MouseEvent.init(data) event.PointerID = dataIntProperty(data, "pointerId") event.Width = dataFloatProperty(data, "width") event.Height = dataFloatProperty(data, "height") event.Pressure = dataFloatProperty(data, "pressure") event.TangentialPressure = dataFloatProperty(data, "tangentialPressure") event.TiltX = dataFloatProperty(data, "tiltX") event.TiltY = dataFloatProperty(data, "tiltY") event.Twist = dataFloatProperty(data, "twist") value, _ := data.PropertyValue("pointerType") event.PointerType = value event.IsPrimary = dataBoolProperty(data, "isPrimary") } func handlePointerEvents(view View, tag string, data DataObject) { listeners := getPointerListeners(view, "", tag) if len(listeners) == 0 { return } var event PointerEvent event.init(data) for _, listener := range listeners { listener(view, event) } } // GetPointerDownListeners returns the "pointer-down" listener list. If there are no listeners then the empty list is returned. // If the second argument (subviewID) is "" then a value from the first argument (view) is returned. func GetPointerDownListeners(view View, subviewID string) []func(View, PointerEvent) { return getPointerListeners(view, subviewID, PointerDown) } // GetPointerUpListeners returns the "pointer-up" listener list. If there are no listeners then the empty list is returned. // If the second argument (subviewID) is "" then a value from the first argument (view) is returned. func GetPointerUpListeners(view View, subviewID string) []func(View, PointerEvent) { return getPointerListeners(view, subviewID, PointerUp) } // GetPointerMoveListeners returns the "pointer-move" listener list. If there are no listeners then the empty list is returned. // If the second argument (subviewID) is "" then a value from the first argument (view) is returned. func GetPointerMoveListeners(view View, subviewID string) []func(View, PointerEvent) { return getPointerListeners(view, subviewID, PointerMove) } // GetPointerCancelListeners returns the "pointer-cancel" listener list. If there are no listeners then the empty list is returned. // If the second argument (subviewID) is "" then a value from the first argument (view) is returned. func GetPointerCancelListeners(view View, subviewID string) []func(View, PointerEvent) { return getPointerListeners(view, subviewID, PointerCancel) } // GetPointerOverListeners returns the "pointer-over" listener list. If there are no listeners then the empty list is returned. // If the second argument (subviewID) is "" then a value from the first argument (view) is returned. func GetPointerOverListeners(view View, subviewID string) []func(View, PointerEvent) { return getPointerListeners(view, subviewID, PointerOver) } // GetPointerOutListeners returns the "pointer-out" listener list. If there are no listeners then the empty list is returned. // If the second argument (subviewID) is "" then a value from the first argument (view) is returned. func GetPointerOutListeners(view View, subviewID string) []func(View, PointerEvent) { return getPointerListeners(view, subviewID, PointerOut) }